ICM - HEC-22 Combination Inlet for continuous grade inlets
Currently ICM has 6 FWHA Gully Inlet types:
ContCo Continuous Curb Opening
ContG Continuous Grate
SagC Sag Combination
SagCO Sag Curb Opening
SagG Sag Grate and
UPC Grate
A commonly used Inlet type (particularly in QLD Australia) that is missing from this list is the combination (curb opening + grate) on a continuous grade.
Section 4.4.4.4. in the HEC-22 manual discuss the capacity of these inlets where the curb opening precedes the grate in the direction of flow. It would be particularly useful to include this option in ICM rather than assuming a grate only inlet type or having to engineer rating curves for these inlets particularly when running blockage sensitivity.
I note that XPSWMM and InfoDrainage include this option.
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Matthew Piggott
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